/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicMesh3.h
Splits the edge between two vertices at the midpoint, if this edge exists
Ok on success, or enum value indicates why operation cannot be applied. Mesh remains unmodified on error.
[EMeshResult](API\Runtime\GeometryCore\UE__Geometry__EMeshResult) SplitEdge ( int EdgeVertA, int EdgeVertB, [FEdgeSplitInfo](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3\FEdgeSplitInfo) & SplitInfo )